Hopper mount for roll coating machines



Oct. 4, 1932. H, E VAN DERHOEF 1,880,605

HOPPER MOUNT FOR ROLL COATING MACHINES Filed Nov. 5, '1950 2 Sheets-Sheet 1 Henry E. VanDerhoef,

Mom-W mxm Oct. 4, 1932. H. fYAN DERHOEF I 1,880,605

HOPPER mouufrdn' ROLL COATING MACHINES Filed Nov. 5. 1930 2 Sheets-Sheet 2 .14 syn/newton: HenryE. Werhaef,

Patented Oct. 4, 1932 UNITED STATES PATENT OFFICE COMPANY, OF ROCHESTER, NEW YORK,.A. CORFORATION OF NEW YORK HOPPER MoUNr ron norm COATING MACHINES Application filed November 5,1930. Serial No. 493,566.

My invention relates to apparatus for the treatment of liquids or plastic materials, and more particularly to apparatus for the making of sheets or films from viscose compositions known in the art as dope.

In coating thin layers on a support or base, or for producing a film of material of substantially constant thickness, much difiiculty has been met with, due to the fact that vibrations arising from numerous causes are transmitted to the dope spreading device or hopper through the machine frame, drive casing, etc, which cause cross lines inthe dope as it is being deposited on the dope receiving surface. This is especially true while running the machine on thin stock at a high rate of speed. Under this condition vibrations become, more numerous and of greater amplitude and those of different frequencies intercepting one another are additive to form exaggerated points or beats of vibration. The effect of these vibrations is to cause intermittent flow of dope from the hopper thus forming bands or ridges of various thickness.

Investigation shows that these harmful vibrations come from three main sources, first the machine drive, second, moving air in the circulation system and, third, vibrations transmitted through the walls and floor of the building from other machinery.

Vibrations coming under one and three may be materially reduced by installing quiet drives and properly cushioning various I parts of the machines, but moving air columns in the wheel casing and dryer casing cause certain agitations which create violent vibrations in the casing imparting this same motion to all light parts of the machine, and a tremor throughout the entire framework, and it has been found impractical to eliminate the source of these vibrations.

It is an object of my invention'to provide a machine for the manufacture of sheets or film in which the effect of the above-mentioned vibrations is materially reduced so that sheets or films of substantially uniform thickness are obtainable,

Another object of my invention is the prov1s1on of film making apparatus in which vibrations inthe dope receiving surface arev 1 HENRY E. VAN DERHOEF, OF ROCHESTER YORK, ASSIGNOR TO EASTMAN KODAK duplicated the dope spreading device or hopper.

In film making apparatus of the rotary drum type,.the heaviest individual member r is the drum and its shaft and due to its great weight it is'slow to respond to or be afiiected by vibrations and it is an object of my invention to provide such apparatus in which the 130 dope hopper is supported by therotary drum or its associated shaft whereby the hopper receives only the diminished vibrations transmitted by the heavy drum and shaft.

Another object of nay-invention is to provide a hopper supported entirely upon the shaft or axle of the rotarydrum. Other objects and advantages of my invention will be apparent from the following description when read in connection with the accompanying drawings in which all the viewsare more or less diagrammatic. i

Figure l'is a side-elevation showing a general application ofmy invention.

Figure 2 is a detailed view of a pendulum mount'for the hopperwith parts broken away.

Figure 3 is an end view partly in section of Fig. 2 apparatus.

Figure 4 shows my invention'applied to film apparatus of the endless'belt type.

Like reference characters represent like parts in'all the views. r

'In the drawings, the base 10 supports the bearings 11- for the shaft 12 of a wheel or .5

rotary drum 13, the cylindricalperipheral facing 14 of the drum 13. moves during rotation in the directionof the arrow 15 from a dope supplying hopper 1 6 to the film stripping rollers 17.

The hopper 16 is preferably of the usual type having walls 18 and 19 which are adjustillustrating an assembly of the able for varying the thickness of the layer of materialbeing flowed upon the drum face 14. All of these details are well known in the art and further explanation is unnecessary. j

As illustrated in Fig.4, thedope receiving surface 14 comprises an endlessbelt-carried on the drums 13 and 13 in a well known manner and the dope is applied by the hopper 16 i at a pointwhere the endless belt 14 is in contact with the drum 13. From this it is obvious that my improved hopper mount is equally applicable to the endless belt type of apparatus and its advantages will be apparent from the following description. The frame supportingthe hopper 16 comprisesrthearms 20 pivoted in bearing-relation on the drum shaft 12 between the drum 13 and the bearings 11. Lengthwisemovement' of the arm 20 on the shaft 12 isp re-j vented by 'thecol'lars or'sleeves '21 and 22.

The drum 13 is firmly secured tothe shaft. 12 in any suitable manner to form an integral 15 materially afieoted by exterior vibrations.

' in'g; relation "with said drum.

mass, which, due to its great-weightis not 1 tion .Witha' rotary drum mounted on a shaft of a frame pivoted on said shaft and weighted to hold the frame stationary and a hopper-mounted on said frame in-dope'spread Signed at B0chester, New York, this th day of October, 1930;

j HENRY E. VAN DERHOEF.

The portions of the shaft 12 extending from g 'thedmin 13 may be considered as trunnions and for convenience will hereinafter be refer-red toas such from time to time.

The hopper 16 and its supporting arms20 must be stabilized in order to remain-in the position illustrated and this maybe accomplished by a pendulum 23ora'l-inkage 24.- wees to some stationary support asthe baselO; 7 r Asishownin Figs. .1, 2'and 8, the pendulum 23 is rigidly connected with the hopper supporting arm 20 andiits mass may be adjusted by 'addition'or removal of the weights .26. The-arms 20 and pendulum 23 are free to rotate on the trunnions .12 and due to the greater" weight of the pendulum 23 the hopper'16' will be held in the upright position illustrated. Y V V 1 Thepossible movement of the pendulum 23 is preferably limited so that it will not swing through any considerable angle, although slight movement, of course, must be permitment: is shown in Fig-3was comprising a stop ted. One-method of limiting such move- I or lug 27 mounted on or secured to the base lO'which is adapted to project between the screws 28 carried by a suitable support29 mounted? on the pendulum 23 in any desired manner. v A

(WVhile I have shown and described one embodiment of my invention, I donot intend to=belimited thereto as modifications will of my invention or the scope .ofthe claims herein.

WVhat I claim. as new and desireto secure by Letters Patent of the United States is:

readily-suggest themselves to those skilled in 'thlsart without departingfrom the spirit 7 r A film manufacturing apparatusof the .a pendulum associated with saidframe for,

" holding it against rotation, fixed bearings for said shaft and stops mountedon said bearings for pendulum.

- 2.. A film makingimachine including adope limiting the swinging of said 1epo sit ing dev ice, a dope receiving. rotary 

